Host-nuclease inhibitor protein gam(gam) comes from Enterobacteria phage lambda. Originally the gam gene product was assigned to the sequence shown and it was suggested that the gene kil protein is encoded from within this gene and corresponds to residues 41-138. For an alternative assignment of this gene see the entry for the kil gene protein of lambda. The function of the protein inhibits the host recBC-coded nuclease and thus promotes the late, rolling-circle mode of lambda DNA replication. Synonyms: Host-nuclease inhibitor protein gam,gamma